Don't bother, if you must, take feats that allow you to perform rituals of a certain category for free once per day. Given your comment on not having any magical items at level 6, really don't bother.
Rituals are... strange. They exist for three meta-purposes: to shore up areas where the party is weak, to circumvent the plot, and to enable unusual plot. In almost all of these cases, they require what amounts to negotiation with the DM as to their use. (My DM tended to get very annoyed with my epic character when I tried to trivially route armies via primal groves. At level 20+, the 4000 gp needed to create an entrance to a specific grove is not even pocket change. ) Money in 4e is a very very odd thing, more a component of character than aspect outside-of-character.
Therefore, don't bother trying to gather components. If you're severely undergeared, ritual prices will only make it worse. Instead, take either the vistani heritage (Vistani Pathfinding, Vistani Jongelur) feats that allow mastery of certain schools, or the School Mastery (I recommend Deception Mastery). While travel and exploration are excellent ritual schools, their primary purpose is to get you around large swathes of uninteresting countryside, effectively allowing you to travel at the power of plot. From a depressingly pragmatic perspective, if you don't have it, the plot changes such that the distances are smaller.
Deception rituals are certainly interesting, but a challenge to DM, especially if your group goes for more standard dungeon crawls. Still, Deception Mastery is a fascinating thing to build one's character around.
As this is designed to power a series of portals, I recommend Vistani Heritage which gives you a vaguely interesting minor action power, and Vistani Pathfinding which:
Benefit: You can master and perform exploration and travel rituals as though you had the Ritual Caster feat. Once per day, you can ignore the component cost of an exploration or travel ritual you have mastered of your level or lower.
Therefore, you can just cast linked portal for free, and at 15, create a teleportation circle for free, once per day.